| Project Background |
| The project site consisted of a 140' x
140' area adjacent to the loading dock of an office
building. The owner wanted to expand the current
building, however, two buried oil tanks, associated
piping, and various utility systems were suspected to be
located within the proposed expansion area. As a result,
Geo-Graf was retained to perform a minimal impact,
nonintrusive geophysical investigation in an attempt to
locate the USTs, buried utilities, and any other
subsurface features or anomalies that could impact the
proposed construction. |
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| Geo-Graf Investigation |
| Geo-Graf utilized 4 different nonintrusive
geophysical delineation techniques, including Ground
Penetrating Radar (GPR), Electromagnetics (EM), Radio
Frequency (RF), and Magnetics (MAG). Multiple subsurface
utilities including natural gas, water, electric, sewer,
and fiber optic cable were detected, field-marked and
documented. Two USTs were also detected: a 25,000 gallon
steel-wall tank and a small metallic UST. |
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| GPR Data Profile |
| Please Wait as
the image below loads. It is actual radar data from a
subsurface assessment project collected by Geo-Graf
engineers utilizing a 120 MHz GPR antenna. |
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| Above: A GPR data profile over the
proposed construction area. Multiple utilities including
electric and water were detected within close proximity
to a 25,000 gallon UST (also shown above). Depth to the
top of the UST based on GPR data estimates is 4' to 6'
below cover. 120 MHz GPR antenna system. |
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